Revert "Update kiota tool version"

This reverts commit 813ec4f.

Author: bkoelman

.config/dotnet-tools.json

@@ -31,7 +31,7 @@
       "rollForward": false
     },
     "microsoft.openapi.kiota": {
-      "version": "1.22.3",
+      "version": "1.21.0",
       "commands": [
         "kiota"
       ],